20423423131 has 4 divisors (see below), whose sum is σ = 21082243264. Its totient is φ = 19764603000.

The previous prime is 20423423123. The next prime is 20423423179. The reversal of 20423423131 is 13132432402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13132432402 = 2 ⋅6566216201.

It is a cyclic number.

It is not a de Polignac number, because 20423423131 - 2³ = 20423423123 is a prime.

It is a super-2 number, since 2×20423423131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20423423096 and 20423423105.

It is not an unprimeable number, because it can be changed into a prime (20423423231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 329410020 + ... + 329410081.

It is an arithmetic number, because the mean of its divisors is an integer number (5270560816).

Almost surely, 2^20423423131 is an apocalyptic number.

20423423131 is a deficient number, since it is larger than the sum of its proper divisors (658820133).

20423423131 is an equidigital number, since it uses as much as digits as its factorization.

20423423131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 658820132.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 20423423131 its reverse (13132432402), we get a palindrome (33555855533).

The spelling of 20423423131 in words is "twenty billion, four hundred twenty-three million, four hundred twenty-three thousand, one hundred thirty-one".